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FP5

QUANTIM Résumé de rapport

Project ID: IST-2000-26019
Financé au titre de: FP5-IST
Pays: France

Theoretical study of quantum holographic teleportation of images

In the domain of single mode light described by continuous variables (field quadratures), specific quantum information protocols have been proposed, then experimentally implemented, such as quantum cryptography, quantum teleportation or quantum dense coding. One of the aims of the QUANTIM project was to investigate how these protocols could be extended into the domain of images, and in which respect the intrinsic parallelism peculiar to imaging could be used in these protocols. PHLAM, and especially the Saint Petersburg group, subcontractor of PHLAM, in collaboration with INFM, has extensively studied this problem.

They have shown how to prepare in an optimal way a spatially multimode entangled beam, which is the extension to the image problem of the EPR correlated state needed in the single mode teleportation, and how to use a pixellised detection and modulation scheme to exactly imprint, both in phase in amplitude, any input image on a different output beam.

The scheme has indeed a lot of similarities with the usual holographic technique, with the advantage that, in the quantum teleportation scheme, no quantum noise is added by the image reproduction device. A similar analysis is currently made for the problem of dense coding

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Claude FABRE
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